Module: Inspec::DescribeDslLazyLoader

Included in:
RSpec::Core::ExampleGroup
Defined in:
lib/inspec/rspec_extensions.rb

Overview

This module exists to intercept the method_missing class method on RSpec::Core::ExampleGroup and is part of support for DSL plugintypes

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *arguments, &block) ⇒ Object

Support for Describe DSL plugins



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# File 'lib/inspec/rspec_extensions.rb', line 13

def method_missing(method_name, *arguments, &block)
  begin
    backend = metadata[:backend] # populated via Inspec::Runner#add_resource
    resource = Inspec::DSL.method_missing_resource(backend, method_name, *arguments)
    return resource if resource
  rescue LoadError
    # pass through
  end

  # Check to see if there is a describe_dsl plugin activator hook with the method name
  registry = Inspec::Plugin::V2::Registry.instance
  hook = registry.find_activators(plugin_type: :describe_dsl, activator_name: method_name).first

  if hook
    # OK, load the hook if it hasn't been already.  We'll then know a module,
    # which we can then inject into the context
    hook.activate

    # Inject the module's methods into the example group contexts.
    # implementation_class is the field name, but this is actually a module.
    # RSpec works by having these helper methods defined as class methods
    # (see the definition of `let` as an example)
    # So, we use extend to inject the new DSL methods.
    RSpec::Core::ExampleGroup.extend(hook.implementation_class)

    # We still haven't called the method we were looking for, so do so now.
    send(method_name, *arguments, &block)
  else
    super
  end
end